[CRIU] Dealing with VDSO remap

[Cyrill Gorcunov]

On Fri, Mar 20, 2015 at 10:33:38AM +0100, Laurent Dufour wrote:
> 
> You're right Cyrill, a kernel patch is required here. I wrote it and I'm
> about to send it upstream.
> 
> However, there is still a window that cannot be addressed: if a process
> is checkpointed while it is handling a signal, then the checkpointed
> stack will contain a reference to the former vDSO's sigreturn service. I
> guess at restart time, there is a major chance that the restarted
> process is core dumping when returning from the signal handler :(
> 
> I can't see any way to address that.
> May be someone have a great idea ?

Well, if I'm not missing something obvious here, for x86-64 the proxy
vdso would handle that, because we map it at the place where original
vdso was at the moment of checkpoint. Am I missing something?